Abstract
Asian soybean rust caused by Phakopsora pachyrhizi was found on soybean and kudzu in Florida in November of 2004. The initial diagnosis of soybean rust was based on observations of symptoms and urediniospores. The two species of Phakopsora that cause rust diseases on soybean, P. pachyrhizi and P. meibomiae, cannot be differentiated with light microscopy. A rapid DNA extraction and PCR amplification protocol discriminated between the two species. The sequence of the amplified DNA product confirmed this first report of P. pachyrhizi in Florida. Accepted for publication 9 May 2005. Published 13 June 2005.
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